研究目的
To demonstrate the use of a soliton microcomb for the calibration of astronomical spectrographs, enabling the detection of Earth-like exoplanets in the habitable zone through precise radial velocity measurements.
研究成果
The demonstration of a soliton microcomb for astronomical spectrograph calibration marks a significant advancement towards compact, chip-based LFC systems. These systems promise to extend precision RV measurements to remote and mobile environments, facilitating the search for Earth-like exoplanets.
研究不足
The precision of the wavelength calibration was limited by internal drifts of the NIRSPEC instrument rather than the soliton microcomb's performance. Future upgrades to the spectrograph's thermal and mechanical stability could enhance calibration precision.
1：Experimental Design and Method Selection:
The experiment utilized a soliton microcomb for spectrograph calibration, leveraging its compatibility with astronomical spectrograph resolution and eliminating the need for complex filtering steps.
2：Sample Selection and Data Sources:
Observations were conducted at the 10 m Keck II telescope, targeting the G3V star HD 187123 to detect its orbiting planet.
3：List of Experimental Equipment and Materials:
The setup included a silica microresonator, a rubidium clock for frequency reference, and highly nonlinear optical fibre for spectral broadening.
4：Experimental Procedures and Operational Workflow:
The soliton microcomb was stabilized and its output broadened before being fed into the NIRSPEC instrument for calibration.
5：Data Analysis Methods:
Data analysis involved fitting Gaussian profiles to comb lines to determine centroid drifts and assess spectrograph calibration precision.
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